How to set cell color with basic

Using LO 5.4.3.2 on Win_64. I have a spreadsheet that creates a table showing increments in feet and inches, with feet shown in column A, and inches in column B. The first row will be 0 and 0 in columns A and B, the second will be 0 and 1, then 0 and 3, and so on until the 12th row which will be 1 and 0, then the next row will be 1 and 1 and so on. After the table is generated, I would like to set the cell interior color of every 12th row, or range that begins a new foot with a yellow color to easily find the beginning of each new foot. I was trying to do this with a for loop - for i = 0 to footcount step 12, oCell = mySheet.getCellByPosition(footcount, 0), oCell.Backcolor =RGB(255,255,0), next i - This gives me a runtime error "Property or Method not found: Backcolor". Searching for this has given me plenty of examples of how to get the color of a cell, but not how set the color of a cell or range of cells.